A question for 3g subscription package using mikrotik

This is my first post, pardon if there is already a similar case.

i have a mikrotik RB951u with a 3g usb attached. The problem is with one of their internet package/ service where you need to send dtmf. What i have to do is to remove 3g usb modem, place broadband sim on a phone, and do the subscription sequence on the phone, then return the sim and 3g modem back to mikrotik. The problem is my mikrotik is placed outside near window and under a roof, including the 3g usb attached to mikrotik. There is no other way but climb..

the sequence on the phone is like this, press *174# , , press 1, wait few seconds for menu to pop up, press 4, wait few seconds, press 6, wait for confirmation. Could the sequence be done using mikrotik?

I tried looking for similar topics but i cant find anything similar to this. i hope my ISP would take notice a offer an sms subscription instead. I believe the package was meant for 3g smartphones. (but also works with mikrotik too).

thanks in advance,